Weed flora changes in cotton growing areas during the last decade after irrigation of Harran plain in Sanliurfa, Turkey.

摘要

In order to determine changes in weed flora due to continuous cotton production related to irrigation, the results of surveys performed in 1995-96 and was recently performed at the end of July 2004, were compared. Based on the results of the first surveys (1995-96), 36 weed species belonging to 14 botanical families were identified and in the second survey (2004), 24 species were recorded. Amaranthus albus, Amaranthus retroflexus, Convolvulus arvensis, Cynodon dactylon, Echinochloa colonum Echinochloa colona, E. crus-galli, Physalis angulata, Physalis philadelphica, Setaria verticillata, Solanum nigrum, Sorghum halepense and Xanthium strumarium were more frequent and with the highest densities. It was assumed that as well as the other factors, irrigation and continuous cotton cultivation had an important role in influencing the shift of weed flora..